Title of article :
Banach module valued separating maps and automatic continuity
Author/Authors :
MOUSAVI, L. islamic azad university - Department of Mathematics, ايران , SADY, F. tarbiat modares university - Faculty of Mathematical Sciences - Department of Pure Mathematics, تهران, ايران
Abstract :
or two algebras A and B, a linear map T:A longrightarrow B is called separating, if xcdot y=0 implies Tx cdot Ty=0 for all x,yin A. The general form and the automatic continuity of separating maps between various Banach algebras have been studied extensively. In this paper, we first extend the notion of separating map for module case and then we give a description of a linear separating map T:B longrightarrow X, where B is a unital commutative semisimple regular Banach algebra satisfying the Ditkin s condition and X is a left Banach module over a unital commutative Banach algebra. We also show that if X is hyper semisimple and T is bijective, then T is automatically continuous and T^{-1} is separating as well.
Keywords :
Banach algebras , Banach modules , separating maps , cozero set , point multiplier , automatic continuity
Journal title :
Bulletin of the Iranian Mathematical Society
Journal title :
Bulletin of the Iranian Mathematical Society